Just finished playing recently.
I like intrigue in the beginning, the idea of rehabilitation of people who have troubles with interpersonal communication and making them to discover joys of it and also friedship, trust and maybe more. I like how you have made that creepy feeling with derelict region. Resembles a rust belt somehow by it's mood.
I like how Senri's appartment, shop interior and university's auditorium backgrounds are done.The way how designed posters in those cinema.
By the way the main character, Ken doesn't have signs of inability to communicate at a first sight, and it's not convincing, I think.
I like the idea of showing dialogue history as a text on phone's screen.
Lets talk about general feel: it seems that city is mostly empty. I haven't hear a background noise of people walking communicating and so on. I have seen a crowd only once in that community centre. Through all game the feeling that city is almost desolated and there are only Chief, Bartender, co-worker, those girls, Stalker in a suit, and enigmatic Old man are in a whole city. There no one on the streets. Kyotarou wears only a t-shirt all the time even when he is outdoors and it is snow laying around

- He's in tshirt even when snowy.
Located near community centre
. In contrary Setsuna always wears coat canted with fur even indoors

- fur canted coat indoors
. By the way, snow is painted over the render image and lacks shadows.
Then also visual inconsistency - character are drawn like in manga with a simple shading. The way we see the horizon line ad how we see girls it sims that main chartacter is extremely short.

- shortness and level of horison
The backrounds are rendered in 3 different ways in one game - semi-realistic shading like in the cold zone caffe

- cold zone interior
, at Senri`s squat room

- inside Senri's place
, at Ken's bathroom

- Ken's bathroom
, unrealistic rendering like in anime movies - we see that outside of the house where Ken rents an appartment

- оutside Ken's apartment
, at the shop

- shop
. Then we see mix of realistic render, unrealistic cell-shading with overpainting like the snow outside the convenience store

- unrealistic snow
and sometimes with photos like in city view,

- new district background with photos as the shops indoors

- photo of footwear shop and horizon level
where some footwear shop is located and is represented with photo of that store. It breaks visual consistency.
Also when we see Ken and Yukino talking it seems as they almost lay on that cold brick pavement, but dont ever understand that. It's creepy.

- on brick pavement they lay?
The game's help info is located outside of the game and can't be viewed from inside. I feel it as inconvenient.
While inside univercity while community is in a room and light comes through the windows, the light signs on Ken's contact lens are almost invisible, because have almost the same brightness as the light from the windows.

- troubles with contact lens and window
I hope the things that I found and described will help you make the game better.Good luck to you!